Date: Thu, 2 Jul 1998 09:07:54 +0200 (MET DST) From: Nick Hibma <nick.hibma@jrc.it> To: FreeBSD hackers mailing list <hackers@FreeBSD.ORG> Subject: Console driver (was: Problems with irq 9(2)?) Message-ID: <Pine.GSO.3.95q.980702085902.16968d-100000@elect8> In-Reply-To: <359A95A3.7188625A@est.is>
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Seeing the message below I just wanted to post a quick remark about the
console driver in 2.2.1 (and looking at the source code in syscons.c
this is still in there in 3.0-SNAP):
Start a utility like top and move the mouse. Wildly. You'll see that the
CPU usage goes up to 20 percent on an AMD K6-166. A bit much for a
mouse, isn't it, even if the mouse is made by Microsoft. :-)
The CPU usage comes from:
#if 1
while (!(inb(crtc_addr+6) & 0x08)) /* wait for vertical retrace */ ;
#endif
Isn't there a way to check in which vertical line the graphical
processor is working and then do a tsleep until it arrives at line
number max-2 and _then_ start to do this idle loop?
Or, much better, use an int routine called by the vertical retrace that
is mentioned in the message below.
Or, maybe I should stick my head in a bucket of water and not pose
problems that do not need to be solved.
Nick
> > Does anybody know if there are problems with interrupt blocking
> > when using interrupt 9(2)? I am having problems with my token
> > ring card getting into a user blocked interrupt state and cannot
> > figure out what to do. This is really screwing up my token
> > ring driver development.
> >
> > Any ideas?
> I am not sure what is going on, but, IRQ 9/2 is often used by vga
> adapters, if you have ISA vga adapter then the trouble can be orginated
> there. Vga cards used IRQ2/9 for some retrace call.
>
> Þórður Ívarsson
> thivars@est.is
>
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